Method of propagating telephonic currents.



c. G. ASHLEY. METHOD OF PROPAGATING TELEPJIONIG OURRENTS. I

APPLIOATIUN FILED JULY 24, 1909. 994 3.61 Patented June 6, 1911.

a sums-enm- 1.

G. G. ASHLEY.

METHOD OF PROPAGATING TELEPHONI G GUBRENTS.

APPLICATION nun. JULY 24, 1909.

Patented June 6, 1911.

UNITED, STATES CHARLES G. ASHLEY, CHICAGD, ILLINOIS,

METHOD OF PROPAGATING TELEPHGNIC CURRENTS.

Specification of Letters Patent.

Patented June 6, 1911.

Application filed July 24, 1909. Serial No. 509,248.

To all whom it may concern:

Be it known that I, Cumulus G. Asncnr, a citizen of the United States of America, and a resident of Chicago, county of Qook, and State of Illinois, have invented a new and useful Improvement in Methods of Propagating Telephonic Currents, of which the following a specification.

My invention relates to telephony, and has for its object the provision of an improved method of reinforcing telephonic currents, whereby conversation may be satisfactorily held over circuits possessing large capacity,as forexamplc,long distance teleplmne circuits, to which end I impress current upon an inducing winding from a source independent of the telephonic cur rent and modify this current by the telephonic current, there being an induced winding or member in association with this inducing winding that serves to impress current upon the telephonic circuit, which current corresponds telephonically to the telephonic current originally impressed, but which is of greater value, whereby the receiving telephone instrument is subject to a stronger telephonic current than that itwould otherwise be subject to were it not for the employment of this inducing winding with its separate source of supply, the imluccd winding, and the agency whereby the telephonic current that is to be rein forced effects av modification of the current in, the inducing winding.

My improved appa 'atus is claimed in my ap .)lication Serial No. 509,250, filed July 24, 1909. (a

I have been able by means of my invention, to construct an apparatus and a. system'that will enable the conduct of conversation-over a single telephonic circuit in both directions. The instrumentality that I prefer toemploy for impressing the inducing winding with the current that is to be modified by the incoming telephonic'current, is a well: constructed formof the socalled uni-polar dynamo or generator, the terminals of which are connected with the terminals of the inducing winding (of very low resistance) to supply thereto current of con'iparatively large volume and small pressure, a. uni-directional current of ten amperes with a pressure of five-tenths of ti volt giving good results. Such current cbndition is maintained in said inducing winding when the telephone circuit is not in use, the

means employed for the purpose of maintaining this current 111 the inducing Winding preferably residing in a local circuit,

including a battery and an exciting coil producing a fieldin the generator rotates. This field, however, may be furnished by a permanent magnet. By rotating the armature at a uniform velocity through this field, which is of uniform flux density, a current of constant volume and pressure is impressed upon the inducing winding as long as the telephonic cireuitis inactive. In order that the current in this inducing winding may be modified, I employ a modifying winding that is subject to the telephonic current initially rent both being changed. The induced winding, by reason of its inductive relation to the inducing winding, has impressed thereupon.current whose pressure is determined by the ratio of transformation between the induced and the inducing winding. the induced current being stepped up in pressure. whereby outgoing telephonic current is impressed upon the telephonic circuit at the relay of far greater value than it is impressed upon the relay, to enable the proper operation of this receiving telephone or instrument that otherwise would only be subject to extremely Weak telephonic current. Thus, a mechanical agency, the power that drives the armature of the uni-polar generator,'. is employed to step-up the telephonic currents at the relay and, in fact,

lied upon as the initial agency for this function if the iron of the field is permanently magnetized, or assumingthat t e armature has been brought to the proper speed, for in this case the field exciting battery or other equivalent source of current (and by battery I mean any suitable form of exwhich the armature of Y this mechanical agency may'alonebe reciting source of current) may be replaced by a shunt connection with the brushes or 11C terminals of the armature, though I preferto'employ the battery orseparate field excitation. The induced winding may be a single coil in bridge between the sides of the telephonic; circuit, in which case the inducing winding is also a single coil or said induced winding may be subdivided into two coils, one in association with one telephone station and the other in association with the other telephone station or receiving station (for it is obvious that more than one instrumentality for relaying telephonic currents in a telephonic circuit may be employed at intervals along the circuit). \Vhere the induced winding is subdivided into coils, the inducing winding is referably common thereto. lVhere the induced winding is in a single'coil, it is preferably in bridge of the telephonic circu t, while the modifying winding is desirably/ in series in the telephonic circuit. In orde that the inducing winding will not react'upon the modifying winding, the said moditying winding divided into two equal parts, the induced winding acting differentially upon these parts of the modifying winding and acting thereby dillerentially upon the inducing circuit.

I will'explain my invention more fully by reference to the accompanying drawing, in which- Figure 1 diagrammatically represents one type of telephonic circuit and apparatus.

equipped in accordancev with my invention. Fig. 2illustrates another type of telephonic circuit and" apparatus equipped in'accordance with invention. 'Fig. 3 is. a longit-udinal section of a uni-polar generator that is preferably employed in practicing the invention. Fig. 4 is a sectional view on line a--a.of Fig. 3.

Like parts are indicated by similar characters of reference throughout the different figures.

Vvhile I have illustrated but two embodiments of my invention, there may be many embodiments thereof, and I do not, there fore, wish to be limited to the two illustrated.

In each of Figs. 1 and 2 I have illustrated telephone sub-stations, A, B, but have omitted the telephone switch-hooks and other auxil' iary apparatus thereat, as an illustration and description of such auxiliary apparatus is not necessary to an understandingof my invention, nor is my invention to be limited to the precise sub-station circuits illustrated. At each sub-station there is shown a telehone transmitter 1 included in a local circult that contains a battery 2 and a primary 3 of an induction coil in inductive relation with the secondary winding 4 included between the sides 55 of the telephonic circuit, a receiver 6 at each'station A, B being serially included in a conductor-5. These sides .5 may be conductively continuous or they may be inductively united. In Fig. 1

they are made conductivel continuous. as

Y 7 for example, by a cord circuit properly constructed. In Fig. 2 they are inductively united, though, as a matter of fact, it is not necessary to provide a conductive or an inductive union between the sub-s.ations of the line, though in the system illustrated in Fig. 2 this is preferred because the inducing winding 7 (hereinafter to be specified) may be common to the coils 8, that are in circuit with the receivers at stations A, ll. The element 8 is the induced winding that has impressed thereupon the reinforced telephonic current that is to operate the telephone receircr at the receiving station. This reinforced telephonic current is impressed upon the winding 8 through the agency of the inducing winding 7 that has current normally impressed thereupon of uniform value, by the unipolar generator, which is diagramnuitically shown in Figs. 1 and 2 and whose structure is illustrated in Figs. 3 and i. The field winding 10 that may be employed to produce the flux which is of uniform density, may be supplied with a constant current from a battery ll, as iu d icated in Fig. 1, or by being connected bc tween the armature brushes l2 13, as indicated in Fig. 2, it being assumed in the case of the system shown in Fig. 2 that the armature has been brought to the proper speed to maintain the field winding 10. there shown in shunt, sufliciently energized to produce the proper flux. In order that the current conditions in the coil 7 may normally be constant, the armature or inductor l i from which the generator current is supplied, is rotated at a. very high uniform peripheral Velocity. The modifying wind ing 15 is serially-related with the telephonic currents initially impressed, this modifying winding being equally divided, so that the induced winding 8 will have dilierential effect thereupon, so that the said winding 15 limited to the influence of the telephonic current led thereto from the transmitting station. In the system shown in Fig. 1 the winding 15 is looped inthe conductor between the telephone stations. In the system shown in Fig. 2 the winding 15 is also in the circuit extending to the transmitting station, though the circuit between the stations of Fig. 2 is not. conductively.continuous.

The influence of the coils 10 and 15 and the structural characteristics of the preferred form cf uni-polar generator will be more readily understood by reference to Figs. 3 and 4, wherein a baseof non-magnetic metal 16 affords a bearing forthe shaft 17 of the armature 14 and also a support for the field shell of tl e generator, that. desirably is made up of two sections 18- 19 sc 'iarably connected, the section. 18 being desirably separably united with the standard 16 for the purpose of easy assemblage of the parts and dashlinesin Fig. 3) is maintained at a minimum. y The shell section 19 is provided with .a. central projection extending toward the .of a safe limiting velocity,

7 through the agency of,

armature, while the shell section 1.8 is prothereby a uniform access to the windings of the generator. The portion of the frame or standard 16 that directly engages the section 18, 18 desirably ring-shaped and threaded to engage a correspondingly threaded shoulder upon the section 18. The armature 14 ISI preferably, though not necessar ly, of cupshape and is desirably made of wrought lIOIl j of very high. permea ility in, order to lessen the reluctance of the ma etic circ itfwh ch magnetic circuit includes the sectioil's 1819 of the field shell, which sections are preferably-made of the 'samematerial and here I constitute a tubular magnet. The reluctance, due to the space between the sections 18-19 in which the armature l tgotates, is made as small as possible, to whic' end the air-gaps between the armature and the pole faces of the sections 18l9 are made as small as practicable, whereby the reluctance of the magnetic circuit (indicated by a dot and vived with a recess that is closed by said projection to constitute an annular space, in which the field windin s 10 and 15 are disposed, the .winding 10 eing of fewer turns preferably than thewinding 15, particularly if this winding'10 is in shunt'of thebrushes or terminals of the machin I Ohe brushf of the machine is desirably in the form of a copper ring 20 that is slotted at (21 to prevent eddy currents, which ring is insulated from, though supported by the central pro- ]BCl '.lOI1 or core portion of the elem 'nt- 319. This ring engages theinner peripheral edge of the armature 14, which engagement is desirably maintained by means of light springs 22. The ring 20 is thus stationarily mounted and a series of taps 23 are taken therefrom and are joined together with one conductor extending to one end of the winding 7.,The other brush collecting current from the armature 14, is desirably the elongated bearing for the shaft 17 which may be equipped with a binding post 24, so that a conductor may be connected with the other side'of the winding 7. The armature maybe dri-ven in any suitable way, preferably a driving belt 25, running at suitable velocit being indicated for the; purpose. A constant field, and density of flux through the cylindrical portion of the armature 14, is maintained by the winding 10. This density of flux is increased or diminished the fluctuating voice currents passing through the winding 15, whereby the volume and pressure of the cur-' rent'impressed upon the winding 7 is variable whenever the said winding 15 is subject .of my invention,

to tele honic curren which current is imstepped-up sufficiently so that the telephonic current received at the relay I have herein disclosed, may be suitably reinforced. The location of the relay, where one only is employed, is preferably midway between the telephone sub-stations. It Wlll be observed that the circuit of the modifying winding 15 is brought into inductive relation with the circuit of winding 7.

It will be seen that I have provided a method of propagating telephonic currents, which consists in establishing a substantially uniform magnetic field or flux, establishing a current by subjecting an inductor to the action of this field, modifying the current in said inductor by modifying the field to which it is subjectedby the telephonic cure rents, transforming the current supplied by the inductor to increase its pressure, impressing the transformed current upon the telephonic circuit, and causing the impressed transformed current to act differentially with respect to the magnetic flux to which the inductor is subjected. The field in which the inductor 14 rotates (said inductor is preferably the rotating member of the generator) is a composite field, when the tele'phonic circuit is in use, one field component being due to the winding 10 and the other field component due to the winding 15., My method of propagating telephonic currents may also be described as consisting in establishing "a current from a source dis tinct from the telephonic currents, modifying said current by inductively associatin telephonic currents with the circuit for sai current, transforming the modified current to increase its pressure, impressing the transformed current upon the telephonic circuit,

and causing the impressed transformed curreht to act differentially with respect to the aforesaid current established from said distinct source. a

While I employ an exciting winding 10 for magnetizing the sections 1819 of the generator, I'do not wish to be limited to such a way of magnetizing these parts of the genera tor, as it is obvious that they may be permanently magnetized, in which event. the winding 10 will be dispensed with.

It is obvious made in the embodiment of the inventionv disclosed without and I do not, therefore, wish to be limited to the precise arrangement and apparatus illustrated,'but

Having thus described my invention, I claim as new and desire to secure by Letters Patent z- V 1. The method of ropagating telephonic currents emanating rom a single telephonic circuit, which c'onsists .in establishing a substantially uniform mag-' nctic field or flux, establishing a current by subjecting aninductor to the action of this stations united by iso fiuX, modifying the current in said inductor by modifying the flux to which it: is subjectedby the telephonic currents emanating from said stat-ions, t anstorming and increasing the pressure of the current supplied by the inductor, impressing the transformed current upon the telephonic circuit, and causing the impressed transformed current to act difierentially with respect to the magnetic flux to which the inductor is sul'ijected.

The method of propagating telephonic currents emanating from stations united by a single telephonic circuit. which consists in establishing a substantially uniform mag netic field or flux, establishing a n'lagnetie field or flux by the telephonic currents cn1a vhating from said stations, creating a uni-di-- rectional current: in a circuit bysubjecting an inductor to the uniform magietic field or flux. modifying the current in the latter circuit by the flux established by the tele phonic currents, transftu-ming and increasing the pressure of the modified .-urrent, impressing the transfornmd current upon the telephonic circuit, and causing the impressed transformed current to act differentially with respect to the magnetic flux.

- t 3. The method of propagating telephonic currents emanating from stations united. by a single telephonic circuit, \rhiclrconsists in establishing a uniform unidirectional current from znsource distinct from the telephonic currents, modifying said (anbrent by inductively associatingtelephonic currents emanating from said statious with the circuit for said current, transforming and increasing the pressure of the modifiedrurrent, impressing the transformed currentupon the telephonic circuit. an'd'causing the llll'lJltSSttl transformed currentto act ditlerentiallr with respect to the aforesaid current cstab lishcd from said distinct source.

4. The method of propagating telephonic currents emanating 'tronrstations united by a. single telephonic circuitg which,consists in establishing a unidirectimialcurrent from a source distinct from the telephonic currents, modifying said current by inductively associating telephonic currents emanating from said stations with the circuit for said current, transforming and increasing the pressure of the mo-ditied-(airrent, impressing the transformedcurrent upon theteiephonic circuit, and causing the impressed transformed current to aot-differentially with respect to the aforesaid current established from said distinct source.

5. The method of propagating telephonic currents emanating from stations united by a single-telephon1c,c1reu1t, which cons sts in establishing a uniform current froma'source distinct from the telephonic currents, modlfying said current by inductively associating telephonic currents emanating from said stations with the circuit; f0 said current, transforming and increasing the pressure of the modified current, impressing the transformed current upon the telephonic circuit, and causing the iinpressed transformed current to act differentially with respectto the aforesaid current established from said distinct source.

(t. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a current from a source distinct from the telephonic currents, modifying said currentby inductively associating telcphonic currents emanating from said stations n'ith the circuit for said ,current, transforming and increasing the pressure of the modified current, impressing the transformed current upon the telephonic circuit, gfllltl causing the impressed transformc,,l current to'act differentially with re; sport to the aforesaitil current established from said'distinct source. I

7. The method of propagating telephonic currents emanating from stations united by a single. telephonic circuit, which consists in establishing a unidirectional current by relative movement between an inductor and a magnetic field or flux, modifying said current by inductively associating telephonic currents emanating from said stations with the circuit for said current, transforming and increasing the pressure of the'modified current, impressing the transformed cur rent upon the telephonic circuit, and causing the impressed tlilllSfOllllt-Kl current to act. differentially with respect to .the unidirectional current.

8. The method of propagating telephonic ru rrents emanating, from stations united by a single telephonic circuit, which consists in establishing a uniform current by relative moven'ient between an inductor and a magnetic field or flux, modifying said current by inductively associating telephonic currents emanatingfrom said stations with the circuit for said current, transforming and increasing the pressure of'the modified current,- impressing the transformed current upon the telephonic circuit, and causing the impressed transformed. current to actd1fferentially with respectto the uni-direc- 'tional current-i entially with respect to the uni-directional current.

10. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a uni-directionalcurrent by relative moven'ient between an inductor and a unifori'n magnetic field or flux, modifying said current by inductively associating telephonic currents emanating from said stations with the circuit for said current, transforming and increasing the pressure of the modifiedcurrent, impressing the transformed current upon the telephonic circuit, and causing the impressed transformed current to act differentially with respect to the uni-directional current.

11. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a uniform current by relative movement between an inductor and a uniform magnetic field or flux, modifying said current by inductively associating telephonic currents emanating from said stations with the circuit for said current, transforming and increasing the pressure of the modified current, impressing the transformed current upon the telephonic circuit, and causing the impressed tansformed current to act differentially with re spect to the uni-directional current.

12. The method ofpropagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a current by relative movement between an inductor and a uniform magnetic field or flux, modifying said current by. inductively associating telephonic currents emanating from said stations with the circuit for said current, transforming and increasing the pressure of the modified current, impressing the transformed cur 'ent upon the telephonic circuit, and causing the impressed transftn'med current to act (11L ferentially with respect to the uni-directiona] current.

13. i The method of propagating telephojnic currents emanating from stations united by a single telephonic circuit, which consists in establishing a substantially. uniform magnetic field or flux, establishing a magnetlc field or flux by the telephonic currents emanating from said stations, creating a current in a circuit by subjecting a'u inductor to the uniform magnetic field or flux, modifylng the current in the latter circuit by the flux established by the telephonic currents, transforming and increasingthe pressure of the rmuilifiml current, impressing the transfornm'l current upon the telephonic circuit, and causing the impressed transformed current to act differcntiallv with respect to the magnetic flux- 14-. The method of propagating telephonic.

currents emanating from stations united by a single telephonic circuit, which consists in establishing a l'nagnetic field or flux, establishing a current by subjecting an inductor to the action of this flux, modifying the current in said inductor by modifying the flux to which it is subjected-by the telephonic currents emanating from said stations, transforming and increasing the pres sure of the current supplied by the inductor, impressing the trai'isformed current ,upon the telephonic circuit, and causing the impressed transformed current to act (lilferentia'lly with respect to the magnetic flux to which the inductor is subjected.

15. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a magnetic field or flux, establishing a magnetic field or flux by the telephonic currents, creating a unidirectional current iira circuit by subjecting an "inductor to the magnetic field or flux, modifying the current in the latter circuit by the' flux established by the telephoniccurrents emanating from said stations, transforming and increasing the pressure of the modified current, impressingthe transformed cur rent upon the telephonic circuit, and cansmg the impressed transformed current to act differentially with respect to the magnetic flux.

16. The method of propagating telephonic currents emanating from stations united by a'single telephonic circuit, which consists in establishing a magnetic field or flux, establishing a magnetic field or flux by the telephonic currents, creating a current in a circuit by subjecting an inductor to the magnetic field or flux, modifying the current in the latter circuit by the flux established by the telephonic currents emanating from said stations, transforming and increasing the pressure of the modified current, impressing the transformed current upon the telephonic circuit, and causing the impressed transformed current to act differentially with respect to the magnetic flux.

17. The method of propagating telephonic currents emanating from stations united by a single-telephonic circuit, which consists in establishlng a magnetic field or flu'x, estab vlishing a current by subjecting an inductor to the action of this flux, modifying the current. in said inductor by modifying the flux to which it is subjected -by the telephonic currents emanating from said stations,

transforming and increasing the pressure of the current supplied by the inductor, im pressing the transformed current upon the telephonic circuit, and causing the impressed transformed current to act differcntially with respect to the magnetic flux to which the inductor is subjected.

18. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a magnetic field or flux, estab lishing a magnetic field or flux by the telephonic currents, creating a current in a circuit by subjecting an inductor to the magnetic field or flux. modifying the current in the latter circuit by the flux established by the telephonic currents emanating from said 10 stations, transforming and increasing the pressure of the modified current, impressing the transformed current upon the telephonic circuit, and causing the impressed trans formed current to act differentially with respect to the magnetic flux to which the inductor is subjected.

19. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a substantially uniform magnetic field or flux, establishing a current by subjecting an inductor to the action of this flux, modifying the current in said inductor by 'modifying'theflux to which it is subjected-by the telephonic currents passing from either station to the other over said single telephonic circuit, transforming and increasing the pressure of the current supnlied by the inductor, and im aressing the transformed current upon the telephonic circuit.

20. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a substantially uniform mag-- netic field or flux, establishing a magnetic field or flux by the telephonic currents pass ing from either station to the other over said single telephonic circuit, creating a unidirectional current in a circuit by subjecting an inductor to the uniform magnetic field or flux, modifying the current in the latter circuit by the flux established by the telephonic currents emanating from said stations, transforming and increasing the pressure of the modified current, and impressing the transformed current upon the telephonic circuit.

21. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a uniform uni-directional cur- .rcnt from a source distinct from the tele- A phonic currents passing from either station gtO the other over said single telephonic cira single tcle honic circuit, which consists-in "establishing a unidirectionalcurrent from a source distinct from thetelephonic currents passing from either station to the other over said single telephonic circuit, modifying said current by inductively associating telephonic currents emanating from said stations with the circuit for said current, transforming and increasing the pressure of the modified current, and impressing the transformed current upon the telephonic circuit.

23. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a uniform current from a source distinct from the telephonic currents passing from either station to the other over said single telephonic circuit, modifying said current by inductively associating telephonic cur 'ents emanating from said stations with the circuit for said current, transforming and increasing the pressure of the modified current, and impressing the transformed current upon the telephonic circuit.

24-. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a current from a source distinct from the telephonic currents passing from either station to the other over said single telephonic circuit, modifying said current by inductively associating telephonic currents emanating from said stations with the c ir' ouit forsaid current, transforming and 1ncreasing the pressure of the modified current, and-impressing the transformed current upon the telephoniccircuit.

25. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a uni-directional current by relative movement between an inductor and a magnetic field or flux, modifying said current by inductively associating telephone currents passing from either station to the other over said single telephonic circuitwith' the circuit for said current, transforming and increasing the pressure of the modified current, and impressing the transformed current upon the telephonic circuit.

26. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists, in establishing a uniform current by relative movement between an inductor and a magnetic field or flux. modifving said current by inductively associating telephonic currents passing from either station to the other overpaid single telephonic circuitwith. the circuit for said current. transforming and increasing the pressure of the modified current, and impressing the transformed current upon the telephonic circuit.

27. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consist-s in establishing a current by relative moven'ient between an inductor and a mag netic-field or flux, modifying said current by inductively associating telephonic cur rents passing from either station to the other over said single telephonic circuit with the circuit for said current, transforn'iing and increasing the pressure of the modified current, and impressing the trai'i'sformed current upon the telephonic circuit.

28. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a uni-directio1n1l current by relative movement between an inductor and a uniform magnetic field or flux, modifying said current by inductively associating telephonic currents passing from either station to the other over said single telephonic circuit with the circuit for said current, transforming and incraasing the pressure of the modified current, and impressing the transformed current upon the telephonic circuit.

25). The method of propagating telephonic currents emanating from stations united by a single telephonic circuit. which consists in establishing a uniform current by relative movement between an inductor and a uniform magneticfield or l'lux. modifying said current by inductively associating telephonic currents passing from either-station to the other over said single telephonic circuit with the circuit for said current. trans'lorun in." and increasing the pressure of the modified current, and im'm-cssing the transformed current upon the telephonic circuit.

30. The method of propagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a current by relative move mentbetween an inductor and a uniform magnetic field or liux, modifying said current by inductively associating telephonic currents passing from either station to the other over said single telephonic circuit with the circuit for said current, transforming and increasing the pressure of the moditicd current. and impressing the transformed current upon the telephonic circuit.

31. The method of ')|'opagating telephonic currents (.unanating from stations united by a single telephonic circuit, which consists in providing a magnetic field or l'iux, modi- :l'ying said magnetic field or flux by the telephonic currents passing from either station to the other over said single telephonic circuit, providing a rotating inductor in said flux, transforming and increasing the pressure of the current caused to [10W in the inductor, and impressing the transformed current upon the tele 'ihonic line.

32. The method of propagating telephonic currents emanating from stations united by a sii'igle telephonic circuit, which consisis in providing a uniform i'nagnetic field or flux, modifying said magnetic field or flux by the telephonic currents passing from either station to the other over said sing e sists in establishing a magnetic field or flux,

establishing a current by subjecting a rotating inductor to the action of this flux, modifying the current in said inductor by modifying the flux to which it subjected Y Y by the telephonic currents passing from either station to the other oversaid single telephonic circuit trz'u'isforming and increasing the pressure of the current supplied by the inductor. and impressing the transformed current upon the telephonic circuit.

34. The method of propagating telephonic currents en'lanating from stations united by a single telephonic circuit, which consists in establishing a magnetic field or flux, establishing a magnetic field or flux by the telephonic currents passing from either sta tion to the other over said single telephonic circuit, creating a current in a circuit by subjecting a rotating inductor to the first mentioned magnetic field or flux. modfyng the current in the latter circuit by the flux established by the telephonic currents emanating from said stations, transforming and in creasing the pressure of the modified current, and impressing the transformed cur rent upon the telephonic circuit.

35. The method of propagating telephonic currents emanating from stations united by a single telephol'iic circuit, which consists in establishing a substantially uniform magnetic field or flux, establishing a magnetic field or flux by the telephonic currents passing from either station to the other over said single telephonic circuit, creating a current in a circuit by subjecting a rotating inductor to the first mentioned uniform magnetic field or flux, modifying the current in the latter circuit by the flux established by the telephoniccurrents emanating from said stations, transforming and increasing the pressure of the modified current, and impressing the transformed current upon the telephonic circuit.

36. The method of propagating telephonic currents emanating from stationsrunited by a single telephonic circuit, which consists in establishing a magnetic field or flux, establishing a current by subjecting a' rotating inductor to the action of this flux, modifying the current in said inductor by modifying the flux to which it is subjected-by the telephonic currents passing from either station to the other over said single telephonic circuit, transforming and increasing the pressure of the current supplied by the inductor, and impressing the transformed current upon the telephonic circuit.

3?. The method of 1i ropagating telephonic currents emanating from stations united by a single telephonic circuit, which consists in establishing a magnetic field or flux, establishing a magnetic field or flux by the tele phonic currents passing from either station to the other over said single telephonic circuit, creatinga unidirectional current in a circuit by subjecting a rotating inductor to the first mentioned magnetic field or flux, modifying the current in the latter circuit by the fiuX established by the telephonic currents emanating from said stations, transforming and increasing the pressure of the modified current and impressing the transformed current upon the telephonic circuit. 38. The method of propagating telephonic currents emanating from stations united by a" single telephonic circuit, which consists in establishing a magnetic field or flux, establishing a magnetic field or flux by the tele phonic currents passing from either station to the otherover said single telephonic circuit creating a current in a circuit by subjecting a rotatin inductor to the first mentioned magnetic field or flux, modifying the current in the latter circuit bythe flux established by the telephonic c rrents emanating from said stations, traniv Jrming and increasing the pressure of the modified current, and impressing the transformed current upon the telephonic circuit. 1

' 39. .Themethod of propagating telephonic currents emanating from either station of a single telephone line, which consists in amplifying the current Wave by inductively associating the telephonic currents from either station of said single line telephone, with a current induced by motion of an inductor in a uniform magnetic field, maintained by an outside source of energy; in increasing the voltage by transformer action and impressing the amplified and transformed current upon the telephone circuit.

l0. The method of propagating telephonic currents emanating from either station of a single telephone line, which consists in creating a unifo'rmmagnetic field or flux by an outside source of energy, modifying said field or flux by inductive influence of telephonic currents emanating from either station of said telephone line, inducing a current, corresponding to the thus modified field or flux, by means of an inductor moving in said field or flux, transforming induced current to increase pressure, and impressing the thus amplitied and transformed current upon the telephone line.

ll. The method of propagating telephonic currents emanating from either station of a single telephone line, which consists in creating amagnetic field or flux of constant value, bringing into inductive infiuence'with this field orfluX a magnetic field or flux of varying value, produced by telephonic currents from either station ofsaid telephone line, thusproducing a varying field. or flux Which produces an amplified currentin a moving inductor, transforming said amplified current toincreased pressure and-impressing resultant current upon the telephone circuit.

Signed by me at Chicago, county of Cook and State of Illinois this fifteenth day of July, 1909.

CHARLES G. ASHLEY.

lVitnesses 1 DAVID S. Hui/FISH, HARRIET L. SMITH. 

